def say_hello():
    print("Hello, world!")
    
    
say_hello()
def say_hi():
    name = 123
    
    return name
print(say_hi())

def sum(a,b):
    return a+b
def multiply(a,b):
    return a*b
def div (a,b):
    if b==0:
        return "Error: division by zero"
    return a/b
def my_min(a,b):
    if a<b:
        return a
    else:
        return b
def my_max(a,b):
   return a if a>b else b

print("%d,%d,%d,%s"%(sum(2,3),multiply(2,3),min(2,3),div(2,0)),end=" ")
print(my_max(2,3))
def calc(a,b):
    mul = a*b
    div = a/b if b!=0 else "Error: division by zero"
    return mul,div
print(calc(2,3))
x,y = calc(2,3)
print(x,y)
print("x={} , y={} ".format(x,y))